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bpf: Fix OOB in pcpu_init_value

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix OOB in pcpu_init_value An out-of-bounds read occurs when copying element from a BPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the same value_size that is not rounded up to 8 bytes. The issue happens when: 1. A CGROUP_STORAGE map is created with value_size not aligned to 8 bytes (e.g., 4 bytes) 2. A pcpu map is created with the same value_size (e.g., 4 bytes) 3. Update element in 2 with data in 1 pcpu_init_value assumes that all sources are rounded up to 8 bytes, and invokes copy_map_value_long to make a data copy, However, the assumption doesn't stand since there are some cases where the source may not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data. the verifier verifies exactly the size that the source claims, not the size rounded up to 8 bytes by kernel, an OOB happens when the source has only 4 bytes while the copy size(4) is rounded up to 8.

Announced Source revision 1
Original source ↗

CVE-2026-53076

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-53076

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db",
        "lessThan": "e19c5ed9f1922a6854073f8651a63fa7be26e9e9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db",
        "lessThan": "e0378419b0e20178b5d100b27c9cc7e51064202e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db",
        "lessThan": "6086079e6d1c32ba4c4b422612b8aebb1129a96c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db",
        "lessThan": "634a793d0e1c822412095d25a1338f8831ad894c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db",
        "lessThan": "576afddfee8d1108ee299bf10f581593540d1a36",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c602ad2b52dcbca5af08e5137bd5575c039b52e3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ab68b940dd6f7b5f8e2557937162dcb8a0583a05",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.4.78",
        "lessThan": "5.5",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.9.9",
        "lessThan": "5.10",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "kernel/bpf/hashtab.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.141",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.91",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.33",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/bpf/hashtab.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53076

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40744 · Revision 1
Added to Heist Feed
Publisher date
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